Sudden Hearing Loss Causes & Symptoms

Tuesday, September 12, 2017 9:01:59 AM Australia/Melbourne

Sudden hearing loss can be dramatic and worrisome. In some cases, it represents a medical emergency. In many instances, unfortunately, people do not seek treatment for their sudden hearing loss, which may lead to permanent damage to the affected ear.

In other cases, even when prompt care is given, it may not be possible to determine the cause of sudden hearing loss, which can hinder treatment. In fact, less than one fifth of cases have an identifiable cause. Nevertheless, in 10 to 15 percent of cases, there is an identifiable cause.

What Causes Sudden Hearing Loss?

There are many sudden hearing loss causes. That is part of the problem in identifying any single cause in most cases: It could be any number of things, and sometimes, there is more than one factor at play.

Some sudden hearing loss causes comprise head trauma, tumour of the ear, and certain autoimmune diseases. Some drugs can cause sudden hearing loss, as can Lyme disease and syphilis.

An Immunological Response

Sudden hearing loss can be a symptom of an illness. It can also be a symptom of an ear infection (often caused by bacteria or a virus, such as otitis media). Blood may be drawn and tested to rule out certain diseases.

Another cause is autoimmune disease. The hearing system is sometimes attacked by the overactive immune system, resulting in sudden hearing loss.

A Symptom of Another Disorder

Other sudden hearing loss causes are related to disorders in other bodily systems. For example, a metabolic imbalance can sometimes affect a person’s hearing, resulting in a sudden loss of hearing. Thyroid issues are often the underlying cause in these cases.

Issues in the circulatory system can also cause sudden hearing loss, as can certain neurological disorders. Testing will be needed in order to determine the role played by these potential causes in any given case of SHL.

Cochlear and Inner Ear Problems

Sudden hearing loss causes include problems within the hearing system itself. Inner ear problems, such as Meniere’s disease, can cause SHL. The same is true of cochlear issues. In rare cases, cancer or benign tumour growths on the auditory nerve or brain can also cause SHL.

Since these causes are most directly associated with the loss of hearing, these are the causes that are most likely to be investigated first (and discovered, if present). If there is nothing wrong with the ear itself, testing will be expanded to explore other potential causes.

What Are the Symptoms?

Although there are many sudden hearing loss causes, most cases will not have a readily discernible cause. Nevertheless, cases of sudden hearing loss present with symptoms, although those symptoms do vary by patient and cause.

Symptoms include a sudden drop in hearing, of more than 30 decibels in three days or less. Some patients may hear a loud “pop” just before their hearing vanishes. It’s less common, but some will experience pain especially if it is related to infection in the middle ear. Many patients will have dizziness and problems with their balance, and almost all patients have some degree of tinnitus, or ringing of the ears.

Onset is rapid, although it varies from patient to patient. Sudden hearing loss can affect one ear or both ears; it commonly affects just one.

Getting Prompt Treatment

No matter the underlying cause, SHL should be treated promptly. While not often a true emergency, immediate treatment can help preserve your hearing. Many people with SHL recover some of their hearing spontaneously; however, a lack of treatment may mean that your hearing is permanently lost or damaged.

Given the diversity of sudden hearing loss causes, you should seek treatment and testing if you experience it. Most of the associated medical problems are very treatable but could cause significant illness or in rare cases, death if left untreated.

If you experience sudden hearing loss (SHL), contact an audiologist immediately for diagnosis and a medical referral, if necessary. And be sure to check out Associated Audiologists’ site for more information about audiology.

Author bio: Associated Audiologists are doctoral-level professionals. They are Fellows of the American Academy of Audiology, are certified by the American Speech-Language-Hearing Association, and uphold a professional code of ethics and operate by our mission and core values: integrity, compassion, innovation, personalized service, and excellence. The Associated Audiologists team also serves as ad hoc graduate faculty with the University of Kansas-Medical Center.

Hearlink Admin

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